Synthesis and properties of some monolithic silica carbogels produced from polyethoxydisiloxanes dissolved in ethylacetoacetate (etac) and acid catalysis

Begag, R.; Pajonk, G.M.; Elaloui, E.; Chevalier, Bruno

doi:10.1016/s0254-0584(99)00005-x

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…In short, these parameters rule the nanostructuration of the resulting gel (primary particles size, pores size distribution, fractality, tortuosity, density, etc.). To better control this nanostructuration, researchers have developed two-step processes so that they can successively favor one or another type of catalysis [39], a trick which is used, for example, to elaborate ultralight silica aerogels [40] or to achieve a good compromise between low thermal conductivity and high optical transparency [41]. The latter aerogels were synthesized first with H 2 SO 4 catalysis of TEOS in ethanol under a substoichiometric molar ratio H 2 O/TEOS ¼ 1.8, followed by a second catalysis step with HF in ethylacetoacetate.…”

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confidence: 99%

SiO2 Aerogels

Pierre

Rigacci

2011

Aerogels Handbook

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International audienceThis chapter focuses on one of the most studied aerogel materials, silica aerogels. It aims at presenting a brief overview of the elaboration steps (sol-gel synthesis, aging, and drying), the textural and chemical characteristics (aggregation features, porosity, and surface chemistry), the main physical properties (from thermal, mechanical, acoustical, and optical, to biological, medical, etc.), and a rather broad panel of related potential applications of these fascinating nanostructured materials. It cannot be considered as an exhaustive synopsis but must be used as a simple tool to initiate further bibliographic studies on silica aerogels

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confidence: 99%

SiO2 Aerogels

Pierre

Rigacci

2011

Aerogels Handbook

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“…The wet gel synthetic process has been described in detail elsewhere [8,9]. Wet gels were prepared from the commercial polyethoxydisiloxane precursor P 750 (PCAS 2 , Longjumeau, France) by using P 750 and ethylacetoacetate (EtAc) in a 50:50 volume ratio and aqueous solutions of 21 N HF (2 vol.%) as a catalyst.…”

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confidence: 99%